Mobility assistive device



FIG. 1 is a top, left front perspective view of a mobility assistive device showing my new design;

FIG. 2 is a front elevational view thereof, the left side, right side, and back elevational views (omitted) being identical;

FIG. 3 is a top plan view thereof; and,

FIG. 4 is a bottom plan view thereof.

The broken lines depict portions of the article that form no part of the claimed design. 

CLAIM The ornamental design for a mobility assistive device, as shown and described. 